Mouthpiece



FIG. 1 is a perspective view of a mouthpiece showing my design;

FIG. 2 is a further perspective view thereof;

FIG. 3 is a yet further perspective view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom view thereof.

Portions of the mouthpiece in FIGS. 1-6 depicted in broken lines do not form a part of the claimed design. 

CLAIM The ornamental design for a mouthpiece, as shown and described. 